A shocking video showing a crossbow-wielding man threatening to "assassinate the Queen in revenge for the 1919 Jallianwala Bagh massacre" has emerged, after a 19-year-old who scaled the Windsor Castle`s spiked fence was sectioned, the Daily Mail reported. 

British police on Monday said they were investigating the video linked to the armed intruder, who was arrested at the monarch’s Windsor Castle on December 25. The Sun said the video was sent from the suspect’s Snapchat account shortly before he was arrested.